Saudia Arabia would move quickly to acquire nuclear weapons if Iran successfully tests an atomic bomb, according to a report.

Citing an unidentified Saudi Arabian source, theÂ Times newspaper in the U.K. (which operates behind a paywall) said that the kingdom would seek to buy ready-made warheads and also begin its own program to enrich weapons-grade uranium.

The paper suggested that Pakistan was the country most likely to supply Saudi Arabia with weapons, saying Western officials were convinced there was an understanding between the countries to do so if the security situation in the Persian Gulf gets worse. Pakistan and Saudi Arabia have denied such an arrangement exists.

Iran, which follows the Shiite branch of Islam, and Sunni Saudi Arabia are major regional rivals.

The Times described its source for the story as a “senior Saudi,” but gave no other details.